This lens was included with my first Pentax DSLR—my K10D. I really just needed a general zoom to go with my first DSLR. However, after using this lens for a couple of years following the purchase of my Pentax smc DA 12-24mm F4.0 ED AL (IF), I realized how lousy this lens was in terms of IQ and performance. I just tended to forget about it and use my Pentax smc DA 12-24mm F4.0 ED AL (IF) until I was fortunate enough to get a really nice general zoom—my Pentax smc DA* 16-50mm F2.8 ED AL ...